I am interested in creating a new paired delimiter using tikzpictures I defined. There has to be something easy I'm missing, but hours of searching has proved fruitless. Here is what I have so far:
\documentclass{article}\usepackage{mathtools}\usepackage{tikz}\def\pewl{\hspace{.075cm}\begin{tikzpicture}[scale=1, baseline=1mm, line width=.23mm]\draw (0mm,3.25mm) -- (0mm,1mm);\draw (0mm,3.25mm) arc (180:90:.8mm);\draw (0mm,1mm) arc (180:270:.8mm);\end{tikzpicture}}\def\pewr{\hspace{-.01cm}\begin{tikzpicture}[scale=1, baseline=1mm, line width=.23mm]\draw (0mm,3.25mm) -- (0mm,1mm);\draw (0mm,3.25mm) arc (0:90:.8mm);\draw (0mm,1mm) arc (0:-90:.8mm);\end{tikzpicture}}\DeclarePairedDelimiter{\pew}{\pewl}{\pewr}\begin{document}$$\pewl M\pewr \pewl g\pewr \pewl f\pewr \pew{M} \pew{g} \pew{\sum}$$\end{document}which begets:
and an error saying:
Missing delimiter (. inserted).
I'm on Overleaf, if that's relevant somehow. Any help would be much appreciated!